.gitlab-ci.d: Raise timeout on cross-accel build jobs to 60m

The current 30 minute timeout on the cross_accel_build_job template
is a bit low: sometimes if the k8s runners are running slow the
can hit it, for example this cross-arm64-xen-only job hit the
30 minute timeout while still not quite finished with the compile:
https://gitlab.com/qemu-project/qemu/-/jobs/8401277985

This is partly a "runner performance can be unpredictable" issue:
https://gitlab.com/qemu-project/qemu/-/jobs/8391726482
is the same job from just a day earlier and it finished in
16 minutes. But we already have build jobs that are higher
timeouts than 30 minutes, so we have headroom to raise the
timeout here to something we're less likely to hit on a slow
runner.

Bump the cross_accel_build_job timeout to 60 mins.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20241118153226.1524542-1-peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/crossbuild-template.yml

@@ -57,7 +57,7 @@
   extends: .base_job_template
   stage: build
   image: $CI_REGISTRY_IMAGE/qemu/$IMAGE:$QEMU_CI_CONTAINER_TAG
-  timeout: 30m
+  timeout: 60m
   cache:
     paths:
       - ccache/